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ppmbrighten - change an images Saturation and Value from an HSV map
ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>
Reads a portable pixmap as input. Converts the image from RGB space to HSV space and
changes the Value by <+- value> as a percentage. Likewise with the Saturation. Doubling
the Value would involve
ppmbrighten -v 100
to add 100 percent to the Value.
The 'n' option normalizes the Value to exist between 0 and 1 (normalized).
Copyright (C) 1990 by Brian Moffet Copyright (C) 1989 by Jef Poskanzer.
Permission to use, copy, modify, and distribute this software and its documentation for
any purpose and without fee is hereby granted, provided that the above copyright notice
appear in all copies and that both that copyright notice and this permission notice appear
in supporting documentation. This software is provided "as is" without express or implied
This program does not change the number of colors.
20 Nov 1990 ppmbrighten(1)
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